jackc/compiler/compiler-scopes.c

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2021-01-04 15:00:48 -05:00
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <pthread.h>
#include "compiler.h"
#include "compiler-scopes.h"
#include "os.h"
typedef enum { local, staticseg, arg, fieldseg } MEMSEGMENT;
char* memsegnames[] = { "local", "static", "argument", "this" };
// Error messages
void doubledeclaration(const char* name, DEBUGINFO* d1, DEBUGINFO* d2);
void ensurenoduplicate(SCOPE* s, char* name);
// Getters
VAR* getvarinvars(VAR* vars, const char* name);
CLASS* getclass(SCOPE* s, const char* name);
SUBROUTDEC* getsubroutdecfromlist(SUBROUTDEC* start, char* name);
SUBROUTDEC* getmethod(SCOPE* s, VAR* parent, SUBROUTCALL* call);
SUBROUTDEC* getfunction(SCOPE* s, SUBROUTCALL* call);
SUBROUTDEC* getsubroutdecwithparent(SCOPE* s, SUBROUTCALL* call, VAR** varret);
SUBROUTDEC* getsubroutdecwithoutparent(SCOPE* s, SUBROUTCALL* call);
SUBROUTDEC* getsubroutdec(SCOPE* s, const char* name);
// Scope adding
VAR* mkvar(char* type, char* name, bool primitive, DEBUGINFO* debug, MEMSEGMENT seg, int i);
void addvar(SCOPE* s, VAR** dest, VAR* v);
void addlocalvar(SCOPE* s, VARDEC* v, int* i);
void addstaticvar(SCOPE* s, CLASSVARDEC* v);
void addfield(SCOPE* s, CLASSVARDEC* v, int* i);
void addclassvardec(SCOPE* s, CLASSVARDEC* v, int* i);
void addparameter(SCOPE* s, PARAMETER* p, int* i);
// Error messages
void doubledeclaration(const char* name, DEBUGINFO* d1, DEBUGINFO* d2) {
eprintf("Double declaration of '%s' at '%s', line %i; previously defined at '%s', line %i\n",
name, d1->file, d1->definedat, d2->file, d2->definedat);
exit(1);
}
void notdeclared(const char* name, DEBUGINFO* debug) {
eprintf("'%s' not declared; file '%s', line %i\n", name, debug->file, debug->definedat);
exit(1);
}
void invalidparent(SUBROUTCALL* call) {
eprintf("Invalid subroutine parent '%s'; file '%s', line %i\n", call->parentname, call->debug->file, call->debug->definedat);
exit(1);
}
void ensurenoduplicate(SCOPE* s, char* name) {
VAR* v = getvar(s, name);
if(v != NULL)
doubledeclaration(name, s->currdebug, v->debug);
CLASS* c = getclass(s, name);
if(c != NULL)
doubledeclaration(name, s->currdebug, c->debug);
SUBROUTDEC* sr = getsubroutdec(s, name);
if(sr != NULL)
doubledeclaration(name, s->currdebug, sr->debug);
}
// Scope handling
SCOPE* mkscope(SCOPE* prev) {
SCOPE* s = (SCOPE*)malloc(sizeof(SCOPE));
s->previous = prev;
if(prev != NULL)
s->compiler = prev->compiler;
s->localvars = NULL;
s->fields = NULL;
s->staticvars = NULL;
s->parameters = NULL;
s->classes = NULL;
s->subroutines = NULL;
return s;
}
// Getters
VAR* getvarinvars(VAR* vars, const char* name) {
while(vars != NULL) {
if(!strcmp(vars->name, name))
return vars;
vars = vars->next;
}
return NULL;
}
VAR* getvar(SCOPE* s, const char* name) {
VAR* var = getvarinvars(s->localvars, name);
if(var != NULL)
return var;
var = getvarinvars(s->parameters, name);
if(var != NULL)
return var;
var = getvarinvars(s->fields, name);
if(var != NULL)
return var;
var = getvarinvars(s->staticvars, name);
if(var != NULL)
return var;
if(s->previous != NULL)
return getvar(s->previous, name);
return NULL;
}
CLASS* getclass(SCOPE* s, const char* name) {
CLASS* curr = s->classes;
while(curr != NULL) {
if(!strcmp(curr->name, name))
return curr;
curr = curr->next;
}
if(s->previous != NULL)
return getclass(s->previous, name);
return getosclass(s->compiler->os, name);
}
SUBROUTDEC* getsubroutdecfromlist(SUBROUTDEC* start, char* name) {
while(start != NULL) {
if(!strcmp(start->name, name))
return start;
start = start->next;
}
return NULL;
}
SUBROUTDEC* getmethod(SCOPE* s, VAR* parent, SUBROUTCALL* call) {
CLASS* c = getclass(s, parent->type);
SUBROUTDEC* d = getsubroutdecfromlist(c->subroutdecs, call->name);
if(d == NULL)
return NULL;
if(d->subroutclass != method) {
eprintf("Calling a function/constructor as if it were a method; file '%s', line %i\n", call->debug->file, call->debug->definedat);
exit(1);
}
return d;
}
SUBROUTDEC* getfunction(SCOPE* s, SUBROUTCALL* call) {
CLASS* c = getclass(s, call->parentname);
if(c == NULL)
notdeclared(call->parentname, call->debug);
SUBROUTDEC* d = getsubroutdecfromlist(c->subroutdecs, call->name);
if(d == NULL)
return NULL;
if(d->subroutclass == method) {
eprintf("Calling a method as if it were a function; file '%s', line %i\n", call->debug->file, call->debug->definedat);
exit(1);
}
return d;
}
SUBROUTDEC* getsubroutdecwithparent(SCOPE* s, SUBROUTCALL* call, VAR** varret) {
VAR* parent = getvar(s, call->parentname);
if(parent != NULL) {
if(parent->primitive) {
eprintf("Primitive type does not have subroutines; file '%s', line %i\n", call->debug->file, call->debug->definedat);
exit(1);
}
*varret = parent;
return getmethod(s, parent, call);
}
else
return getfunction(s, call);
}
SUBROUTDEC* getsubroutdecwithoutparent(SCOPE* s, SUBROUTCALL* call) {
SUBROUTDEC* d = getsubroutdecfromlist(s->currclass->subroutdecs, call->name);
return d;
}
SUBROUTDEC* getsubroutdecfromcall(SCOPE* s, SUBROUTCALL* call, VAR** varret) {
SUBROUTDEC* d;
*varret = NULL;
if(call->parentname != NULL) {
d = getossubroutdec(s->compiler->os, call);
if(d == NULL)
d = getsubroutdecwithparent(s, call, varret);
}
else {
d = getsubroutdecwithoutparent(s, call);
}
if(d == NULL)
notdeclared(call->name, call->debug);
return d;
}
SUBROUTDEC* getsubroutdec(SCOPE* s, const char* name) {
SUBROUTDEC* curr = s->subroutines;
while(curr != NULL) {
if(!strcmp(curr->name, name))
return curr;
curr = curr->next;
}
if(s->previous != NULL)
return getsubroutdec(s->previous, name);
return NULL;
}
// Scope adding
VAR* mkvar(char* type, char* name, bool primitive, DEBUGINFO* debug, MEMSEGMENT seg, int i) {
VAR* v = (VAR*)malloc(sizeof(VAR));
v->name = name;
v->type = type;
v->debug = debug;
v->memsegment = memsegnames[seg];
v->primitive = primitive;
v->index = i;
return v;
}
void addvar(SCOPE* s, VAR** dest, VAR* v) {
ensurenoduplicate(s, v->name);
if(!v->primitive) {
CLASS* type = getclass(s, v->type);
if(type == NULL)
notdeclared(v->type, v->debug);
}
v->next = *dest;
*dest = v;
}
void addlocalvar(SCOPE* s, VARDEC* v, int* i) {
STRINGLIST* currname = v->names;
while(currname != NULL) {
addvar(s, &(s->localvars), mkvar(v->type, currname->content, v->primitive, v->debug, local, *i));
currname = currname->next;
(*i)++;
}
}
void addstaticvar(SCOPE* s, CLASSVARDEC* v) {
STRINGLIST* currname = v->base->names;
pthread_mutex_lock(&(s->compiler->staticmutex));
static int i = 0;
while(currname != NULL) {
addvar(s, &(s->staticvars), mkvar(v->base->type, currname->content, v->base->primitive, v->base->debug, staticseg, i));
currname = currname->next;
i++;
}
pthread_mutex_unlock(&(s->compiler->staticmutex));
}
void addfield(SCOPE* s, CLASSVARDEC* v, int* i) {
STRINGLIST* currname = v->base->names;
while(currname != NULL) {
addvar(s, &(s->fields), mkvar(v->base->type, currname->content, v->base->primitive, v->base->debug, fieldseg, *i));
currname = currname->next;
(*i)++;
}
}
void addclassvardec(SCOPE* s, CLASSVARDEC* v, int* i) {
if(v->type == stat)
addstaticvar(s, v);
else {
addfield(s, v, i);
}
}
void addparameter(SCOPE* s, PARAMETER* p, int* i) {
addvar(s, &(s->parameters), mkvar(p->type, p->name, p->primitive, p->debug, arg, *i));
(*i)++;
}
// Group adding
void addclassvardecs(SCOPE* s, CLASSVARDEC* classvardecs) {
int i = 0;
while(classvardecs != NULL) {
addclassvardec(s, classvardecs, &i);
classvardecs = classvardecs->next;
}
}
void addlocalvars(SCOPE* s, VARDEC* localvars) {
int i = 0;
while(localvars != NULL) {
addlocalvar(s, localvars, &i);
localvars = localvars->next;
}
}
void addparameters(SCOPE* s, bool isformethod, PARAMETER* params) {
int i = isformethod ? 1 : 0;
while(params != NULL) {
addparameter(s, params, &i);
params = params->next;
}
}
void freevars(VAR* v) {
if(v != NULL) {
VAR* next = v->next;
free(v);
freevars(next);
}
}
void freescope(SCOPE* s) {
freevars(s->fields);
freevars(s->staticvars);
freevars(s->localvars);
freevars(s->parameters);
free(s);
};